This error means that one or more fields you are inserting/updating
contain an invalid value.
Some of the possible scenarios are:
1. A string value is being inserted into a numeric field.
2. An invalid date expression is being inserted into a date field.
3. A string value being inserted is longer than the size of the string field.
4. A null value is being inserted into a field that does not allow nulls.
The use of client-side or server-side
data validation techniques described in
Chapter 6 of the AspGrid manual can help avoid this run-time error.